<!DOCTYPE html>
<html>

<head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title></title>
    <style>
    .left,
    .right {
        width: 300px;
        height: 120px;
    }
    
    .left div,
    .right div {
        width: 200px;
        height: 90px;
        padding: 5px;
        margin: 5px;
        float: left;
    }
    a{
        font-size: 14px;
        display:block;
    }
    .newClass{
        background: #bbffaa;
    }

    .imoocClass{
        background: red;
    }
    .addBorder{
        border: 1px solid red;
    }

    </style>
    <script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script>
</head>

<body>
    <h2>.addClss()与.css()方法区别</h2>
    <div class="left">
        <div class="aaron">
            <a>css优先级高于addClass</a>
            <a>1：第一次addClss背景色</a>
            <a>2：第二次css修改背景色</a>
        </div>
    </div>
    <div class="right">
        <div class="aa bb imooc">
            <article>
                <a>imoocClass</a>
            </article>
        </div>
    </div>

    
    <script type="text/javascript"> 
        //给所有的div统一增加边框
        $('div').addClass('addBorder')
    </script>

    <script type="text/javascript"> 
        //class=left下div元素增加一个新的样式，增加背景颜色
        $('.aaron').addClass('newClass');
    </script>

    <script type="text/javascript"> 
        //通过css覆盖addClass方式设置背景色
        $('.aaron').css({
            'background':'yellow'
        })
    </script>



</body>

</html>